Defect engineering is an effective strategy to improve the activity of two-dimensional molybdenum disulfide base planes toward electrocatalytic hydrogen evolution reaction. Here, we report a Frenkel-defected monolayer MoS2 catalyst, in which a fraction of Mo atoms in MoS2 spontaneously leave their places in the lattice, creating vacancies and becoming interstitials by lodging in nearby locations. Unique charge distributions are introduced in the MoS2 surface planes, and those interstitial Mo atoms are more conducive to H adsorption, thus greatly promoting the HER activity of monolayer MoS2 base planes. At the current density of 10 mA cm-2, the optimal Frenkel-defected monolayer MoS2 exhibits a lower overpotential (164 mV) than either pristine monolayer MoS2 surface plane (358 mV) or Pt-single-atom doped MoS2 (211 mV). This work provides insights into the structure-property relationship of point-defected MoS2 and highlights the advantages of Frenkel defects in tuning the catalytic performance of MoS2 materials. 

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Frenkel-defected monolayer MoS2 catalysts for efficient hydrogen evolution

MoS2/CdS nanosheet-on-nanorod: An efficient photocatalyst for H2 generation from lactic acid decomposition

Hydrazine hydrate-assisted adjustment of sulfur-rich MoS2 as hydrogen evolution electrocatalyst

Facile formation of Mo-vacancy defective MoS2/CdS nanoparticles enhanced efficient hydrogen production

Review on multi-dimensional assembled S-scheme heterojunction photocatalysts

Synthesis and photocatalytic hydrogen activity of Mo1−xS2 nanosheets with controllable Mo vacancies

A novel I-type 0D/0D ZnS@Cu3P heterojunction for photocatalytic hydrogen evolution

Defect MoS2 and Ti3C2 nanosheets co-assisted CdS to enhance visible-light driven photocatalytic hydrogen production

Solar photocatalytic hydrogen production is considered as a potential solution to alleviate the current global energy situation. In this work, a novle CdS spherical nanoparticles/Ti3C2 MXene nanosheet (CM) heterostructure photocatalyst was prepared by in situ growth method, which has the characteristics of high efficiency and stability. The results showed that the CM sample has regular morphology and size. When compared with pure CdS, its specific surface area increased and the hydrogen evolution performance also greatly improved. Among them, the hydrogen evolution of CM-0.06 is 1295 μmol·g−1·h−1 (λ > 420 nm), which is 7 times that of spherical CdS, and it also showed stronger stability. Tight interface contact can promote the transfer and migration of photo-generated carriers, and the effective separation of electron hole pairs can enhance the absorption of visible light. In addition, Ti3C2 MXene acts as an electron trap can further accelerate the separation of photogenerated electrons and holes. The synergistic effect between semiconductor CdS and Ti3C2 MXene nanosheets, which provides a new idea for the design of more stable and efficient CdS-based photocatalysts.

Yingrui Wang

Papers

Synthesis and photocatalytic hydrogen activity of Mo1−xS2 nanosheets with controllable Mo vacancies

Facile formation of Mo-vacancy defective MoS2/CdS nanoparticles enhanced efficient hydrogen production

A novel I-type 0D/0D ZnS@Cu3P heterojunction for photocatalytic hydrogen evolution

Defect MoS2 and Ti3C2 nanosheets co-assisted CdS to enhance visible-light driven photocatalytic hydrogen production

In situ growth of CdS spherical nanoparticles/Ti3C2 MXene nanosheet heterojunction with enhanced photocatalytic hydrogen evolution